Offset Decals
Occasionally, the decal has not been applied exactly in
alignment with the glow positions. Here the glow position is a
few mm to the right of the centre of the figure '2'. Perhaps I'm
being a bit picky...
An Indicator of Tube Age?
Apart from obvious signs of age such a dirt, grime or a
damaged decal, there is little to indicate how well used a tube
is. A physical observation I have made are NIB tubes have a top
glass dome silvering that is is bright and uniform. On tubes
which are clearly used and old, the dome silvering is also
usually not uniform or sometimes significantly worn away. The
tube on the left is (what I believe to be) a new, unused tube. The
silvering just reflects the ceiling and camera. However, the tube on the right shows a sort of
“horseshoe” marking centred above the top of the heater/cathode. (This marking is inside the
tube not on the outside of the glass). I have no proof that these markings occur with age as yet. I
intend to document the visible changes to an E1T tube when I have a clock running in the house
over a period of years. This said, I would be suspicious of an E1T sold as new/NIB/NOS that
showed such markings.
Yes you are….
Ed.
Page 78
Version 1.0
Copyright Grahame Marsh/Nick Stock 2019
Summary of Contents for An E1T Timepiece
Page 82: ...Page 82 Version 1 0 Copyright Grahame Marsh Nick Stock 2019 1 1 SAM3X8C schematic...
Page 108: ...Page 108 Version 1 0 Copyright Grahame Marsh Nick Stock 2019...
Page 109: ...Page 109 Version 1 0 Copyright Grahame Marsh Nick Stock 2019...
Page 110: ...Page 110 Version 1 0 Copyright Grahame Marsh Nick Stock 2019...
Page 120: ...E1T Data Sheet Page 120 Version 1 0 Copyright Grahame Marsh Nick Stock 2019...